The numbers you need are right here. The ones beside the starter are casting numbers but the ones in this picture are the ones that'll tell you what the block came from.
They can be hard to even see, they're usually lightly stamped and can be covered in paint, grease, or rust.
AFM Site Administrator
Member: Mustang Club of America #82740, White Mustang Registry #362, NMRA, Fun Ford Weekend, Mustangs of Burlington
MOOG Certified Technician
For mods and sound clips, see profile and gallery.